This textbook chapter introduces Earth’s external energy source, and the nuclear fusion reactions that power the Sun, space weather and space storms. There is an interview with solar scientist, Dr. Janet Luhmann, UC-Berkeley. The resource includes...(View More) links to current news articles, and a suite of pre- and post-unit assessments. A teacher's guide supports classroom use. This is the fourth chapter in the unit, Energy Flow, exploring the transfer of energy through the atmosphere, oceans, land, and living things over short and long timescales. The resource is part of Global System Science (GSS), an interdisciplinary course for high school students that emphasizes how scientists from a wide variety of fields work together to understand significant problems of global(View Less)